[ARC5] BC659 dummy load

[Richard Knoppow]

    I realize that I misplaced a decimal when calculating the power. I 
got too much power.  57ma in 300 ohms is slightly less than a watt.

On 6/17/2016 12:42 AM, Dave Jackson wrote:
> All:
>
> TM11-615 for the SCR-609A/B and SCR-610A/B calls for a 1/2 wave antenna- a
> fairly high impedance depending on the configuration.  There is an internal
> matching network to make it look like 1/2 wavelength at the system center
> frequency (app. 32.5 MHz)
>
> Page 91, paragraph 127: Minimum Test Requirements calls for a minimum of 1
> watt to the antenna also using a 300 ohm resistor in series with an r.f.
> milliameter on the 0-100 scale.  Figures out to be about 57 ma for just the
> 300 ohm resistor.
>
> Hope this helps,
>
> Dave, WA4OBJ
>
> -----Original Message-----
> From: ARC5 [mailto:arc5-bounces at mailman.qth.net] On Behalf Of Richard
> Knoppow
> Sent: Thursday, June 16, 2016 11:34 PM
> To: arc5 at mailman.qth.net
> Subject: Re: [ARC5] BC659 dummy load
>
>     I am not familiar with this transmitter. If 30 ohms the power would be
> on the order of 13 Watts, does that sound right for it?  300 ohms would be
> close to 130 Watts.
>
>>>     On 6/16/2016 8:26 PM, WA5CAB--- via ARC5 wrote:
>>>     >The only place in any of the literature where I find the use of a
> dummy
>>>     >load mentioned is in TM 11-4023, page 26, paragraph 28.  It says
> that to
>>>     >check the transmitter output power, use a 300 ohm resistor in series
>>>     >with a 0-100 RF milliammeter.  Minimum reading on both channels
>>>     should
>>>     >be 65 mA.
>>>     >
>>>     >Robert Downs - Houston
>>>     >wa5cab dot com (Web Store)
>>>     >MVPA 9480
>>>     >
>>>     >In a message dated 06/16/2016 17:12:51 PM Central Daylight Time,
>>>     >arc5 at mailman.qth.net <mailto:arc5 at mailman.qth.net> writes:
>>>     >>Don't need the military one , but just what the resistance is
> supposed
>>>     >>to be. Anybody know?
>>>     >>
>>>     >>
>>>     >>Jim
>>>     >>Ac2EU
>>
>>
>>     Robert & Susan Downs - Houston
>>     wa5cab dot com (Web Store)
>>     MVPA 9480
>
>
>

-- 
Richard Knoppow
1oldlens1 at ix.netcom.com
WB6KBL